Banging, Screeching and Rattling: What 6 Ordinary Furnace Noises Mean

October 13, 2020

When your furnace is working correctly, it should deliver heat without creating too much disruption. While it’s common to catch your furnace making noise as it begins running, other sounds are showing your furnace requires immediate professional assistance.

Here are some of the most reported furnace noises and what they might be indicating. If your furnace is making an atypical noise, our friendly heating specialists are here to assist with the best furnace repair in Ballwin and St. Charles.

1. Furnace Making a Banging Noise

You might have a critical situation on your hands if you’re hearing your furnace making a banging noise. If your furnace is making a knocking noise, it can signal there could be a couple of problems. These range from gas increasing in your furnace or a ductwork issue.

Banging Sounds Coming from Your Furnace

Your heating system gets filthy over the years, so that’s why it’s critical to set yearly furnace maintenance with Air Alliance Team. One of the tasks our professionals complete during this work is clean your furnace’s burners. When this piece gets grimy, you could hear your furnace making a loud rumbling noise if ignition takes longer than normal. The following gas buildup can break your furnace’s heat exchanger, where natural gas turns into warm air. Any fractures in it can discharge carbon monoxide, which is normally released outdoors. This toxic gas can be lethal in large concentrations.

If you’re aware of banging or knocking sounds coming from your furnace, Air Alliance Team recommends turning it off and reaching us at 636-206-4250. Too much natural gas in your furnace or a fractured heat exchanger are critical troubles that should get prompt repairs.

Banging Sounds Coming from Your Ductwork

Your furnace relies on ductwork to provide hot air across your residence. If the ductwork wasn’t put in right or is getting dated, it can be loud when your furnace is heating. This might be the case if your furnace makes a banging noise when it shuts off. Call Air Alliance Team at 636-206-4250 and we’ll pinpoint the problem.

2. Furnace Making a Buzzing Noise

If you notice your furnace making a buzzing noise, don’t delay calling us. A buzzing sound typically indicates an electrical problem, like with its transformer, blower motor or capacitor.

Your furnace relies on an internal transformer to run on the correct voltage. If wires or the box isn’t tight enough, you might detect a low humming noise in the furnace when off. Your furnace also uses a blower motor, which sends heated or cooled air throughout your space, and a capacitor, which starts the motor. If either of these parts are failing, they will buzz when the furnace starts.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it might be the result of something small, like an unfastened screw, or something serious, like a broken part. In either case, we urge you to shut your furnace off and getting in touch with our heating specialists at 636-206-4250 for assistance.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s on, it’s trying to alert you it requires some TLC. If you’ve forgotten furnace maintenance recently, belts could be worn down or a bearing may need to be lubricated. We know that maintenance often slips your mind, but our technicians can get your furnace running quietly again rapidly.

5. Furnace Making a Whistling Noise

When you’re noticing your furnace making a whistling noise, it’s frequently the result of an air leak in your ductwork. You could also notice whistling while the furnace is working if a floor vent is loose. If you’ve examined your vents but are still sensing whistling, Air Alliance Team can assist you. It’s essential to get loose ductwork fixed without delay, since it can make comfort issues in your residence and increase your heating bills.

6. Furnace Making a Grinding Noise

It’s not a good sign if you notice your furnace making a grinding noise. This metal-on-metal sound typically means there’s an issue with your furnace’s blower. Shut down your furnace off instantly and reach our pros at 636-206-4250 for help.

When you’re getting an atypical noise from your furnace, Air Alliance Team is ready to provide assistance. Contact us at 636-206-4250 to request your furnace repair appointment now.